Description Perbio Choc is the UK’s strongest oil based ready to use insecticide for the instant and on-going control of flies, red mites and all flying and crawling insects. Can be sprayed or fogged with the residual effective for up to 3 months ensuring the treated area remains pest free for a long length of time. For use in and around farm buildings, dairies, animal housing plus amenity areas, sewage works, refuse disposal and waste storage. 0.64% Permethrin & 0.63% Tetramethrin